Pressure dependence of acoustic anomalies of polydimethylsiloxane studied by Brillouin spectroscopy

Shin, Seonhyeop; Ko, Jae‐Hyeon; Park, Jaehoon; Ko, Young Ho; Kim, Kwang Joo

doi:10.1016/j.physb.2015.03.025

Cited by 8 publications

(3 citation statements)

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“…This results in an expected longitudinal modulus of 1.14 GPa to 1.54 GPa. [29], [30] Glycerol-water mixtures are well characterized by Nadkarni et al and have previously been used to evaluate the LSR. [31] For a 90% :10% glycerol-water mixture, the shear modulus at 10 Hz varies between 10 Pa to 100 Pa. [31] The expected Brillouin shift for water and glycerol are 5.12 GHz and 7.24 GHz, respectively.…”

Section: Preparation and Characterization Of Reference Samplesmentioning

confidence: 99%

Non-Invasive Full Rheological Characterization via Combined Speckle and Brillouin Microscopy

et al. 2022

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Rheology serves to measure the deformation and flow of materials. Its associated quantities, for example, the Young's modulus, shear modulus, bulk modulus, or longitudinal modulus, are important in the biomedical field, in particular for soft materials, to characterize the response of materials to external force. Usually, mechanical probes, in particular rheometers or atomic force microscopy, are used to characterize these quantities. In the last decade, optical measurements have been derived to obtain these quantities even in small sample volumes. However, usually only one quantity is evaluated using optical techniques, such as Brillouin microscopy, which does not allow a full rheological characterization. The latter requires measuring at least two quantities, which allows for calculating all further rheological properties. In this paper, we aim to close this gap by combining two optical rheology methods, Brillouin microscopy to measure the longitudinal modulus and Laser Speckle Rheology for the shear modulus. We built an optical setup that allows the non-contact and hence non-destructive and non-invasive measurement of both quantities simultaneously in the same sample using a 780 nm, narrow linewidth (~50 kHz) laser system. We evaluate our approach using defined samples of glycerol and polydimethylsiloxane and we demonstrate image acquisition using the combined setup. We also investigate porcine corneae, as biological samples, and demonstrate direct measurement of longitudinal modulus and shear modulus and calculation of Young´s modulus, bulk modulus, and the Poission ratio, which are all in good agreement with published quantities. In the future, our approach allows for full characterization of the rheology of biological specimens.

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Section: Preparation and Characterization Of Reference Samplesmentioning

confidence: 99%

Non-Invasive Full Rheological Characterization via Combined Speckle and Brillouin Microscopy

et al. 2022

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show abstract

“…The versatility of polymers has allowed them to be used extensively under extreme conditions, as various components in explosives, aerospace, submarine and heavy machinery, where the polymers witness high strain rates, high pressure, and even high temperature. [1][2][3][4][5][6][7][8][9][10][11] Therefore, the deep knowledge of their mechanical properties under extreme conditions is essential for design and development of polymer components. Up to now, several approaches have been explored to achieve this goal.…”

Section: Introductionmentioning

confidence: 99%

“…2 Moreover, various theoretical models have also been applied for the evaluation of extensive EOS data of pure polymers, polymersolvent and polymer blends. [12][13][14][15][16][17] Recently, some polymer samples, such as polyolens, polysiloxanes, and polyimide, have been investigated by high pressure Brillouin scattering spectroscopy technique, [3][4][5][6][7][8][9][10][11] which is a nondestructive method to provide insight into the elastic and bulk mechanical properties of optically transparent materials by measuring their acoustic velocities. The diamond anvil cell (DAC) supplies the high pressure condition.…”

Section: Introductionmentioning

confidence: 99%